Clamp for securing plungers in glass-presses



(ModeL J. R. BRIDGES. Clamp for Securing Plung'ers in Glass-Presses,

No 221,608. Patented MayIS'. 18-80.

WE m 13); ru n mm Q N-PETERS. PNQTQUTNOGHAPIIER. WASHINGTON. D. 0.

UNITED STATES PATENT OFFICE.

JOHN R. BRIDGES, OF PlIILADELPHIA, PENNSYLVANIA.

CLAMP FOR SECURING PLUNGERS IN GLASS-PRESSES.

SPECIFICATION forming part of Letters Patent No. 227,608, dated May 18, 1880.

Application filed March 8, 1880.

To all whom it may concern:

Be it known that I, J OHN R. BRIDGES, of the city of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in Chucks or Clamps for Fastening the Plunger Part of Glass-Molds to the Presses used in the Manufacture. of Pressed- Glassware, of which the following is a specification.

My invention relates to improvements in clamps which are used for fastening the plunger part of molds to the cross-head of presses for pressing and molding glassware.

The invention consists in the arrangement of a fixed disk in which is turned a groove beveled on one side, in combination with two clamps having corresponding beveled projections and a screw-bolt.

Heretofore the principal mode of fastening plungers to the cross-head of presses has been by scrcwbolts passing through the cross-head and screwing into the plunger. The screwing in and out of these bolts takes time, and frequently the screw-threads become stripped. At each starting on a change of mold the plunger is required to be heated up before commencing work, and much time is lost in handling the hot plunger and adjustin g the screws.

With my improvement a change of plungers can be made in a few seconds and without removing of any screws. I attain these objects by the arrangements illustrated in the accompanying drawings, in which Figure 1 is a View of the under face of my improved clamp. Fig. 2 is a vertical section .of the same, and showing a section of the plunger. Fig. 3 is a section showing a modification. Fig. 4 is a view of one of the jaws, and Fig. 5 is a section of the same. Fig. 6 is an edge view of the grooved disk.

Similar letters refer to similar parts throughout the several views.

A represents a disk of cast-iron, into the edge or periphery of which is turned a groove, J. Beveled on the lower side, across the center of this disk, is drilled or cast a hole, K. There are also drilled two holes, G G, into each of which is tapped a screw-thread,

B 13 represent two jaws of cast-iron, made with beveled projections O to fit the bevel in the groove J. These jaws are also provided with projections D, and through each jaw B is drilled a hole, S, for the bolt F. The jaw B on the left hand has the hole S tapped for (ModeL) the screw-thread on the bolt F. The righthand end of bolt F is provided with a collar, E, and the extreme end is made square for a wrench.

The method of applying and using my improvement is as follows The disk A is fastened to the cross-head of the press by two screw-bolts passing through the cross-head and screwing into the holes G G. The plunger H is turned with a flange, as shown in Fig. 2. The bolt F is unscrewed, and the jaws B B will open so as to admit the flange on plunger 11 under the projections D D. By screwing up the bolt F the collar IE will press against the right-hand jaw B, and the screw-thread on the other end of bolt F will draw the two jaws together, and as the bevels on the jaws and in the groove come together will cause the projections l) l) to be tightly drawn against the flange on the plunger H, and this will draw the plunger tight up against the disk A, which is fastened to the cross-head. and the plunger will be firmly fixed in the press for working. By simply slacking the screw F the plunger can be taken out for heating or changing, and replaced withont much trouble or loss of time.

It is obvious that modifications may be made in the method of applying my invention.

The collar E may be placed in the centerot' the bolt F, and a thread cut on each end, one being right, the otherleft hand, the jaws being tapped to correspond.

The flange on plunger H may be turned with a bevel, and the projections D D turned with a corresponding bevel, as is shown in Fig. 3.

If desired, the bevel may be left out of the groove. It and the projections O 0 may be turned square; but for all practical purposes I think the improvement as shown in Figs. 1 and 2 is the best and most simple.

My invention I do not claim as a centeringchuck; but

I desire to claim as my invention- The combination of disk A, having a groove, J, jaws B B, having projections O (J, and bolt F, as shown, described, and for the purpose specified.

JNO. R. BRIDGES.

Witnesses:

J ornv FrrzrArRIcK, JOHN SHINN. 

